I think "AC" here is a verbification of "assistant camera" [1], a role in professional (movie) photography. [1] https://en.m.wikipedia.org/wiki/Focus_puller#:~

I think "AC" here is a verbification of "assistant camera" [1], a role in professional (movie) photography. [1] https://en.m.wikipedia.org/wiki/Focus_puller#:~:text=A%20focus%20puller%20or%20first,or%20action%20is%20being%20filmed https://en.m.wikipedia.org/wiki/Focus_puller#:~:text=A%20foc....